Measured at what age? You definitely don’t have the same skin now as newborn you. Skincolor is dependend as much on nutritional and eviromental factors as it is on genetic ones. In addition to that the genes don’t simply average out your skin tones. There are enough examples of “interracial” couples having 2 children, one being dark skinned and the other being pale. Your base melanin levels and additional melanin production are two entirely different and independend genetic factors.